Explain the mounting of grinding wheels and explain the loading & glazing of grinding wheels.

Explain the mounting of grinding wheels

  • Grinding wheels spin at breakneck speed. It is critical that the grinding wheel is properly installed on the machine spindle. Proper wheel attachment provides safety and lowers the likelihood of wheel failure during usage.

The following things are critical when it comes to wheel installation.

  1. Before installation, the wheel must be thoroughly inspected to ensure that it has not been damaged during shipping, storage, or handling.
  2. Grinding wheel holes are typically coated with lead. The lead bushes should not be loose or protrude past the wheel.
  3. The grinding wheel should easily glide on the spindle. If the bush is too tight, it should be gently reamed.
  4. A flange must be installed on both sides of the wheel. The flanges should be the same size. The diameter of the flange should be greater than half the diameter of the wheel.
  5. The wheel and flange sides should be level and bear evenly all around.
  6. The flanges should be eased in the center such that the sole point of contact between the wheel and the flanges is the annular clamping region.
  7. Secure the inner flange to the spindle by keying, screwing, press fitting, or shrink fitting. The outer flange should slide easily on the spindle so that it may adjust to provide pressure to the wheel.
  8. Compressible washers, also known as blotters, should be installed between the wheel and the flanges. These washers are 1.5 mm thick and fashioned of blotting paper, cardboard, rubber, leather, or any other compressible material. They serve to offset any irregularities in the wheel surface and ensure a tight junction.
  9. A second washer is put on the outer flange’s surface to create a smooth bearing surface for the nut.
  10. The T-nut should be tightened to secure the wheel. Too much pressure is bad because it might destroy the wheel.
  11. Before starting the machine, a wheel guard (not pictured) should be placed over the wheel and fastened.

Explain the loading and glazing of grinding wheels.

Only under optimum operating circumstances will a grinding wheel preserve its sharpness and genuine shape.

In most procedures, this requirement is seldom met. After some time of continuous operation, the grains of the wheel lose their efficacy owing to chip collection or becoming dull due to wear, attrition, and so on.

These situations are caused by wheel loading or glazing. When the area between the grains of a wheel is filled with chips, it becomes nearly useless for taking a cut.

The grain’s sharpness is removed, and the wheel becomes smooth.

The grinding of ductile materials, too dense a grinding wheel, sluggish grinding wheel speeds, insufficient cutting fluid, and too deep a cut are some of the causes of wheel loading.

Glazing is the dulling of the wheel caused by rounding off the cutting edges. It happens as a result of grain breakage and attrition. The wheel becomes smooth and simply offers a rubbing action.

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